Actually, If the EK lease is only short term then this sounds like the plan that Blue Shamu told us about.
He said the 4th A330 would be leased to LH (that must have been changed to EK) for a short period, until Bermuda 2 was lifted and bmi could operate LHR-USA.
BD decided to do this instead of open a new route because:
1) They were told by the UK government that they'd soon have transatlantic rights from LHR
2) If they used the a/c to open up a new US route from MAN or non-US route from LHR, it would look bad if BD ended the route to use the a/c LHR-USA when B2 is dropped
So it doesn't look so bad after all!